Replace IPSec tunnels by app-level ephemeral TLS sessions.

For some reason giraff doesn't like IPSec.  App-level TLS sessions are
less efficient, but thanks to ansible it still scales well.

1 files changed, 44 insertions, 5 deletions

diff --git a/roles/IMAP/templates/etc/postfix/main.cf.j2 b/roles/IMAP/templates/etc/postfix/main.cf.j2
index 46f64aa..40c8d32 100644
--- a/roles/IMAP/templates/etc/postfix/main.cf.j2
+++ b/roles/IMAP/templates/etc/postfix/main.cf.j2
@@ -11,56 +11,95 @@ mail_owner       = postfix
 
 delay_warning_time     = 4h
 maximal_queue_lifetime = 5d
 
 myorigin            = /etc/mailname
 myhostname          = mda{{ imapno | default('') }}.$mydomain
 mydomain            = fripost.org
 append_dot_mydomain = no
 
 # Turn off all TCP/IP listener ports except that necessary for the MDA.
 master_service_disable = !2526.inet inet
 
 queue_directory       = /var/spool/postfix-{{ postfix_instance[inst].name }}
 data_directory        = /var/lib/postfix-{{ postfix_instance[inst].name }}
 multi_instance_group  = {{ postfix_instance[inst].group | default('') }}
 multi_instance_name   = postfix-{{ postfix_instance[inst].name }}
 multi_instance_enable = yes
 
 # This server is a Mail Delivery Agent
 mynetworks_style = host
-inet_interfaces  = 172.16.0.1
-{% if 'MX' in group_names %}
-                   127.0.0.1
-{% endif %}
-inet_protocols   = ipv4
+inet_interfaces  = all
+
 
 # No local delivery
 mydestination        =
 local_transport      = error:5.1.1 Mailbox unavailable
 alias_maps           =
 alias_database       =
 local_recipient_maps =
 
 message_size_limit  = 67108864
 recipient_delimiter = +
 
 # No relay: this server is inbound-only
 relay_transport   = error:5.1.1 Relay unavailable
 default_transport = error:5.1.1 Transport unavailable
 
 # Virtual transport (the alias resolution is already done by the MX:es)
 virtual_transport       = lmtp:unix:private/dovecot-lmtpd
 lmtp_bind_address       = 127.0.0.1
 virtual_mailbox_domains = ldap:$config_directory/virtual/mailbox_domains.cf
 virtual_mailbox_maps    = ldap:$config_directory/virtual/mailbox.cf
 transport_maps          = ldap:$config_directory/virtual/transport_content_filter.cf
 
 # Restore the original envelope recipient
 relay_domains               = $myhostname
 recipient_canonical_classes = envelope_recipient
 recipient_canonical_maps    = pcre:$config_directory/recipient_canonical.pcre
 
 # Don't rewrite remote headers
 local_header_rewrite_clients =
 # Tolerate occasional high latency
 smtpd_timeout                = 1200s
+
+
+relay_clientcerts               = cdb:$config_directory/relay_clientcerts
+smtpd_tls_security_level        = may
+smtpd_tls_cert_file             = /etc/postfix/ssl/{{ ansible_fqdn }}.pem
+smtpd_tls_key_file              = /etc/postfix/ssl/{{ ansible_fqdn }}.key
+smtpd_tls_session_cache_database= btree:$data_directory/smtpd_tls_session_cache
+smtpd_tls_received_header       = yes
+smtpd_tls_ask_ccert             = yes
+smtpd_tls_session_cache_timeout = 3600s
+smtpd_tls_fingerprint_digest    = sha256
+
+
+strict_rfc821_envelopes = yes
+smtpd_delay_reject      = yes
+disable_vrfy_command    = yes
+
+smtpd_client_restrictions =
+    permit_mynetworks
+    permit_tls_clientcerts
+    # We are the only ones using this proxy, but if things go wrong we
+    # want to know why
+    defer
+
+smtpd_helo_required     = yes
+smtpd_helo_restrictions =
+    reject_invalid_helo_hostname
+
+smtpd_sender_restrictions =
+    reject_non_fqdn_sender
+    reject_unknown_sender_domain
+
+smtpd_recipient_restrictions =
+    # RFC requirements
+    reject_non_fqdn_recipient
+    reject_unknown_recipient_domain
+    permit_mynetworks
+    permit_tls_clientcerts
+    reject
+
+smtpd_data_restrictions =
+    reject_unauth_pipelining